High severity · published Mar 30, 2023
CVE-2023-28835
Nextcloud server is an open source home cloud implementation
7.5
CVSS
0.5%
EPSS
No
On KEV
Description
Nextcloud server is an open source home cloud implementation. In affected versions the generated fallback password when creating a share was using a weak complexity random number generator, so when the sharer did not change it the password could be guessable to an attacker willing to brute force it. It is recommended that the Nextcloud Server is upgraded to 24.0.10 or 25.0.4. This issue only affects users who do not have a password policy enabled, so enabling a password policy is an effective mitigation for users unable to upgrade.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.5% · higher than 45% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
NS
Nextcloud Server · Nextcloud
23.0.0 before 23.0.14; 24.0.0 before 24.0.10; 24.0.0 before 24.0.10; 25.0.0 before 25.0.4; 25.0.0 before 25.0.4 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2023-28835
CVE.org
https://www.cve.org/CVERecord?id=CVE-2023-28835
Vendor Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-7w2p-rp9m-9xp9
Issue Tracking
https://github.com/nextcloud/server/pull/36093
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